They also use deceptive, if not fraudulent descriptive practices in describing the origins of their engines.
Apparently their warranty is not worth the paper it's printed on. That's not an issue if you don't have a problem. If you do get one with an issue, you may be on your own unless you choose to litigate.
As has been said before, there ain't no free lunch/you get what you pay for. Those two phrases have been around longer than all of us and for good reason. It doesn't prevent the naive from ignoring them though.